Our 24V solar sites go up to about 28.5 volts when they are in bulk
charge mode, then drop to about 27.5 volts when in float. A typical
"partly cloudty" day is shown below for one of our solar sites. The big
dip in the afternoon was some big clouds rolling through.
So we feel obliged to protect UBNT equipment with a 36/72 V -> 24 V
converter, because I think going up to 28.5V might just let the smoke out.
bp
<part15sbs{at}gmail{dot}com>
On 4/8/2015 12:28 PM, Josh Luthman wrote:
Correct:
continuous 16.8 ~ 31.2VDC
1 second 14.4 ~ 33.6VDC
If you already dropped them to 3v I think they'd be toast.
If you didn't have your charger you're not really testing the
compatibility with Ubnt. I believe the cut off is something like
27.5v for the Airmax stuff and your charge is around 27.3 (depending
on battery). To me, that was too close for comfort and hence I use
the regulator.
I don't know why you would expect them to stop at 10v. At 20v both
Canopy and Ubnt would happily run. The radios would continue to pull
power from the batteries forever.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Wed, Apr 8, 2015 at 3:23 PM, Christopher Tyler
<ch...@totalhighspeed.net <mailto:ch...@totalhighspeed.net>> wrote:
We are currently testing using two 12v 100Ah telecom batteries in
series.
They are slightly expensive to replace, especially when we will
have four (or more) at some sites, most will have two.
I'm using a Meanwell RSD-100B-24 regulator for the Tik RB-493G
router right now. Looks like the cutout for the regulator is
around 16v from what I can decipher from the datasheet.
My test radios (2 Canopy and 2 UBNT) are connected to the battery
without regulation.
This setup will drain the batteries until they are pretty much
dead and buried. I ran them over the weekend and I figured it
would stop draining around 10v at worst, it didn't. They ended up
around 6v in parallel or 3v per battery. I figure I shaved off
some capacity and lifetime of my test batteries with that,
hopefully not too much.
--
Christopher Tyler
MTCRE/MTCNA/MTCTCE/MTCWE
Total Highspeed Internet Services
417.851.1107 <tel:417.851.1107>
----- Original Message -----
From: "Josh Luthman" <j...@imaginenetworksllc.com
<mailto:j...@imaginenetworksllc.com>>
To: af@afmug.com <mailto:af@afmug.com>
Sent: Wednesday, April 8, 2015 1:49:05 PM
Subject: Re: [AFMUG] Low Voltage Disconnect
First off I'd suggest getting enough batteries that you wouldn't
need an
LVD.
Second, I'd rather see my batteries lose a bit of life and keep
the site up
then have everything go down saving my batteries.
Tertiary/finally, what equipment do you have now? My regulator
cuts off at
19v and still provides 24v. I figure the batteries are at 9.5v
they're
already suuuuper low.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Wed, Apr 8, 2015 at 2:44 PM, Christopher Tyler
<ch...@totalhighspeed.net <mailto:ch...@totalhighspeed.net>>
wrote:
> Looking for recommendations on a 24v LVD to protect our
batteries from
> being drained.
> Anyone have one they recommend?
>
> --
> Christopher Tyler
> MTCRE/MTCNA/MTCTCE/MTCWE
> Total Highspeed Internet Services
> 417.851.1107 <tel:417.851.1107>
>
>
